Just an fyi there's a difference in head pipe length between the Don Emler FMF gold series for the 86 & the one for the 87-89. I have both the H-13 & the H-14 & can never remember which one is for what year but I'll verify later if you want to know. I have one on my wife's 86 with an 86 bottom end that has a Hotrods LR crank & an unported 88 oem cylinder at 66.75mm, 86 oem head, ATC head gasket, rad valve & a 38AS & that thing runs like a scalded dog!
I had one on this bike at one time years ago. h13 stands out to me I can't remember anything about this bikes set up it been sitting for 7 years. I do remember the Elmer felt better than this fatty I have on it now